remove double body in b2b example

[BernhardRieder1]

The b2b example renders the PageLayout(The entire content of the page) twice, this fixes that

WHAT is this pull request doing?

It removes the duplicate <PageLayout {...data}>{children}</PageLayout> call

Checklist

• I've read the Contributing Guidelines
• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've added a changeset if this PR contains user-facing or noteworthy changes
• I've added tests to cover my changes
• I've added or updated the documentation

[shopify]

Oxygen deployed a preview of your main branch. Details:

Storefront	Status	Preview link	Deployment details	Last update (UTC)
custom-cart-method	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 23, 2024 9:48 PM
third-party-queries-caching	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 23, 2024 9:48 PM
classic-remix	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 23, 2024 9:48 PM
metaobjects	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 23, 2024 9:48 PM
Skeleton (skeleton.hydrogen.shop)	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 23, 2024 9:48 PM
optimistic-cart-ui	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 23, 2024 9:48 PM

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[BernhardRieder1]

I have signed the CLA!

[blittle]

Thank you for the contribution!